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Finding the Fourth Proportional to 18,809.94, 28,159.53 and 13,901.46

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Solution

The fourth proportional to 18,809.94, 28,159.53 and 13,901.46 is: 20,811.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,809.94 : 28,159.53 = 13,901.46 : x
  2. Step 2: Convert to fraction form
    18,809.94/28,159.53 = 13,901.46/x
  3. Step 3: Cross multiply
    18,809.94x = 28,159.53 × 13,901.46
  4. Step 4: Simplify right side
    18,809.94x = 391,458,579.91
  5. Step 5: Solve for x
    x = 391,458,579.91/18,809.94
  6. Step 6: Final answer
    x = 20,811.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.